Ensure parent id added only when we need an identifier for the child

lib/src/analyzer.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Part of the template compilation that concerns with extracting information
  * from the HTML parse tree.
  */
 library analyzer;
 
@@ skipping 70 matching lines @@
     visitElementInfo(info);
 
     if (_parent == null) {
       _fileInfo.bodyInfo = info;
     }
   }
 
   void visitElementInfo(ElementInfo info) {
     var node = info.node;
 
-    _ensureParentHasQuery(info);
-
     if (node.id != '') info.identifier = '_${toCamelCase(node.id)}';
     if (node.tagName == 'body' || (_currentInfo is ComponentInfo
           && (_currentInfo as ComponentInfo).template == node)) {
       info.isRoot = true;
       info.identifier = '_root';
     }
 
     node.attributes.forEach((name, value) {
       visitAttribute(node, info, name, value);
     });
@@ skipping 19 matching lines @@
 
     var savedParent = _parent;
     _parent = info;
 
     // Invoke super to visit children.
     super.visitElement(node);
     _currentInfo = lastInfo;
 
     _parent = savedParent;
 
-    if (info.identifier == null && _needsIdentifier(info)) {
-      var id = '__e-$_uniqueId';
-      info.identifier = toCamelCase(id);
-      // If it's not created in code, we'll query the element by it's id.
-      if (!info.createdInCode) node.attributes['id'] = id;
-      _uniqueId++;
+    if (_needsIdentifier(info)) {
+      _ensureParentHasQuery(info);
+      if (info.identifier == null) {
+        var id = '__e-$_uniqueId';
+        info.identifier = toCamelCase(id);
+        // If it's not created in code, we'll query the element by it's id.
+        if (!info.createdInCode) node.attributes['id'] = id;
+        _uniqueId++;
+      }
     }
   }
 
   /**
    * If this [info] is not created in code, ensure that whichever parent element
    * is created in code has been marked appropriately, so we get an identifier.
    */
   static void _ensureParentHasQuery(ElementInfo info) {
     if (info.isRoot || info.createdInCode) return;
 
@@ skipping 601 matching lines @@
     end = text.indexOf('}}', start);
     if (end < 0) {
       start = length;
       return false;
     }
     // For consistency, start and end both include the curly braces.
     end += 2;
     return true;
   }
 }